A. A change request that helps improving the project and its product, service or result and is discussed generally in a friendly style. B. A direction by the buyer or an action taken by the seller that the other party considers an undocumented change to the contract. C. A field change or ad-hoc change mandated by the project customer in a public construction project. D. A change request which will lead to the re-construction of an older version of the project performance baseline by the contractor.

Constructive changes are those requested changes where the buyer and seller cannot reach an agreement on compensation for the change or cannot agree that a change has occurred. These contested changes are variously called claims, disputes, or appeals.

Changes which are not resolved can include direction provided by the buyer or actions taken by the seller, is considered as a constructive change to the contract. And any of these constructive changes may be disputed by one party and can lead to a claim against the other party.

Constructive changes are those requested changes where the buyer and seller cannot reach an agreement on compensation for the change or cannot agree that a change has occurred. These contested changes are variously called claims, disputes, or appeals.

Changes which are not resolved can include direction provided by the buyer or actions taken by the seller, is considered as a constructive change to the contract. And any of these constructive changes may be disputed by one party and can lead to a claim against the other party.